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In order for the FDE to have any usefulness, the key has to be derived from a secret that only the user of phone knows (I.e. a secret PIN, password or pattern)
Pretty much my thoughts, yes.
In order for the FDE to have any usefulness, the key has to be derived from a secret that only the user of phone knows (I.e. a secret PIN, password or pattern)
Android devices stopped using FDE a while back. In fact, support for FDE was removed entirely in Android 13.
Sorry, but that’s not true. While technically true, that full disk encryption doesn’t exist anymore, they use file based encryption which, functionally, is the same thing. Source: https://www.androidauthority.com/how-to-encrypt-android-device-326700/
File based encryption is not functionally “the same thing”. The AOSP documentation explains how FBE works much more accurately.